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<html>↩
<head>↩
<script type="text/javascript">↩
window.onload = function() {↩
var ctx = document.getElementById("c1").getContext("2d");↩
ctx.rect(50, 50, 200, 50);↩
ctx.rect(50, 50, 50, 200);↩
ctx.rect(250, 250, -200, -50);↩
ctx.rect(250, 250, -50, -200);↩
ctx.fill();↩
}↩
</script>↩
</head>↩
<body>↩
<div><canvas id="c1" width="300" height="300"></canvas></div>↩
</body>↩
</html>↩